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Homework Help: Mechanics Question

  1. Sep 13, 2010 #1
    A block of mass 3 kg is on a rough inclined plane at 30 degree to the horizontal. The coefficient of friction is 0.2 and a force of 10 N acts upward parallel to the plane. Find the friction?

    The answer to the question is 5N

    my work

    Normal reaction= 30 cos 30

    Using F = u R

    (0.2 x 30 cos 30 )= 5.20 N

    I am not obtaining the answer, and i don't even know whether the method is correct or not as i have not consider the 10 N. Please need help to attempt the question....!!!!!!
  2. jcsd
  3. Sep 13, 2010 #2


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    Homework Helper

    Take g = 9.8 m/s^2.
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